CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jun. 26, 2016	Jul. 02, 2017	Jun. 26, 2016
Income Statement [Abstract]
Net revenues	$ 528,613	$ 473,553	$ 1,016,494	$ 898,446
Cost of goods sold	238,329	217,154	470,650	416,900
Gross profit	290,284	256,399	545,844	481,546
Selling, general and administrative expenses	158,934	142,983	322,903	279,331
Research and development expenses	20,278	15,472	38,105	27,825
Restructuring charges	870	(119)	13,815	9,849
Gain on sale of assets	0	(378)	0	(1,397)
Income from continuing operations before interest, loss on extinguishment of debt and taxes	110,202	98,441	171,021	165,938
Interest expense	19,894	11,907	37,620	25,691
Interest income	(161)	(129)	(330)	(209)
Loss on extinguishment of debt	11	19,261	5,593	19,261
Income from continuing operations before taxes	90,458	67,402	128,138	121,195
Taxes on income from continuing operations	12,095	8,007	9,426	10,620
Income from continuing operations	78,363	59,395	118,712	110,575
Operating income (loss) from discontinued operations	(566)	6	(848)	(376)
Benefit on income (loss) from discontinued operations	(206)	(187)	(309)	(257)
Income (loss) from discontinued operations	(360)	193	(539)	(119)
Net income	78,003	59,588	118,173	110,456
Less: Income from continuing operations attributable to noncontrolling interest	0	285	0	464
Net income attributable to common shareholders	$ 78,003	$ 59,303	$ 118,173	$ 109,992
Basic:
Income from continuing operations (in dollars per share)	$ 1.74	$ 1.36	$ 2.64	$ 2.58
Income (loss) from discontinued operations (in dollars per share)	(0.01)	0.00	(0.01)	0.00
Net income (in dollars per share)	1.73	1.36	2.63	2.58
Diluted:
Income from continuing operations (in dollars per share)	1.67	1.25	2.54	2.29
Loss from discontinued operations (in dollars per share)	0.00	0.01	(0.01)	0.00
Net income (in dollars per share)	1.67	1.26	2.53	2.29
Dividends per share (in dollars per share)	$ 0.34	$ 0.34	$ 0.68	$ 0.68
Weighted average common shares outstanding
Basic (in shares)	44,996	43,549	44,945	42,598
Diluted (in shares)	46,818	47,246	46,716	48,014
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 78,363	$ 59,110	$ 118,712	$ 110,111
Income (loss) from discontinued operations, net of tax	(360)	193	(539)	(119)
Net income	$ 78,003	$ 59,303	$ 118,173	$ 109,992